I think OP's point is the introduction of limits to the benefit of owning multiple properties. Hard to see OP replying with "Oh gosh, darn it you got me again" as a response to your comment and much more likely to further develop policy that would stay true to the idea that being able to afford more means you should pull more weight.
Yeah, now your wife and each kid will fill taxes by themselves and you crack down on that there - you give the free tax benefit as a deduction on your income tax so if your 3 year old doesn't have income there's no benefit. The trust itself can fill taxes, you allow the tax-free benefit to apply to only single individual tax form and force a trust to pay tax.
Just give the tax break on your primary residence. If you don't live there 51% of the year you pay oppressive property tax. Give property tax breaks to landlords that provide affordable housing up to the needs of the area.